/* Variables (CSS Custom Properties) */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-border: #e0e0e0;
  --color-link: #073b66;
  --color-link-hover: #03204b;
  --color-tile-bg: #f9f9f9;

  --max-width-grid: 1200px;
  --gap-grid: 24px;
  --gap-content: 20px;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-large: 32px;
  --font-size-small: 14px;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: var(--font-size-base);
  background: var(--color-bg);
  color: var(--color-text);
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--color-text);
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

/* Header */
.header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0 0 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .logo a {
    font-size: 1.5rem;
    padding-left: 0;
}

.header-content {
  max-width: var(--max-width-grid);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header a {
  padding: 1rem 2rem;
  font-size: 1rem;
}
.logo {
  font-size: 18px;
  font-weight: 600;
}

.logo a {
  color: var(--color-text);
}

.logo a:hover {
  text-decoration: none;
}

nav {
  display: flex;
  gap: 10px;
}

nav a {
  font-size: var(--font-size-small);
}

nav a:hover {
  text-decoration: underline;
}


/* Hero Section */
.hero {
  padding: 80px 20px 40px;
  max-width: var(--max-width-grid);
  margin: 0 auto;
}

.hero-content {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.hero-profile {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.hero-text {
  text-align: left;
  flex: 1;
  padding-top: 20px;
}

.hero h1 {
  font-size: var(--font-size-large);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 20px;
}

.hero p {
  font-size: 20px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}


@media (max-width: 640px) {
  main {
    padding: 0 10px;
  }
  .header {
    padding: 12px 0;
  }

  .header-content {
    flex-wrap: wrap;
    gap: 16px;
    flex-direction: column;
    align-items: center;
  }

  .logo {
    font-size: 16px;
    width: 100%;
    text-align: center;
  }

  .logo a {
    display: block;
    padding: 0;
  }

  nav {
    gap: 20px;
    width: 100%;
    justify-content: center;
  }

  nav a {
    padding: 0;
    font-size: 14px;
  }

  .hero {
    padding: 30px 0 20px 0;
  }

  .hero-content {
    flex-direction: column;
    gap: 20px;
    align-items: center;
  }

  .hero-profile {
    width: 150px;
    height: 150px;
  }

  .hero-text {
    text-align: center;
  }

  .hero h1 {
    font-size: 1.4rem;
  }

  .hero p {
    font-size: 16px;
  }
}

/* Main Content */
main {
  background: var(--color-bg);
}

/* Grid Container */
.tiles-grid {
  max-width: var(--max-width-grid);
  margin: 0 auto;
  padding: 40px 20px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap-grid);
}

@media (max-width: 1024px) {
  .tiles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .tiles-grid {
    grid-template-columns: 1fr;
    gap: var(--gap-content);
    padding-top: 20px;
  }
}

/* Tile */
.tile {
  background: var(--color-tile-bg);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.tile-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: #e8e8e8;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  overflow: hidden;
}

.tile-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.tile-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.tile-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.tile-description {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.tile-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.tile-links a {
  display: inline-block;
  padding: 8px 16px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-link);
  font-size: var(--font-size-small);
  font-weight: 500;
  transition: all 0.2s ease;
}

.tile-links a:hover {
  background: var(--color-link);
  color: var(--color-bg);
  text-decoration: none;
  transform: scale(1.05);
}

.tile-links a:active {
  transform: scale(0.98);
}

/* Blog Section */
.blog-section {
  max-width: var(--max-width-grid);
  margin: 40px auto;
  padding: 0 20px;
}

.blog-section h2 {
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 30px;
}

.blog-list {
  list-style: none;
}

.blog-list li {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.blog-list li:last-child {
  border-bottom: none;
}

.blog-item-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.blog-item-title a {
  color: var(--color-text);
}

.blog-item-title a:hover {
  color: var(--color-link);
  text-decoration: none;
}

.blog-item-meta {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.blog-item-summary {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Footer */
footer {
  background: var(--color-tile-bg);
  border-top: 1px solid var(--color-border);
  padding: 40px 20px;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  margin-top: 60px;
}

footer a {
  color: var(--color-link);
}

/* Article Page */
article {
  max-width: var(--max-width-grid);
  margin: 0 auto;
  padding: 40px 20px;
}

article h1 {
  font-size: 36px;
  font-weight: 600;
  margin-bottom: 20px;
}

.article-meta {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: 30px;
}

.article-content {
  line-height: 1.8;
  color: var(--color-text);
}

.article-content h2 {
  font-size: 24px;
  font-weight: 600;
  margin-top: 30px;
  margin-bottom: 15px;
}

.article-content h2 code {
  font-size: 24px;
}

.article-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 12px;
}

.article-content p {
  margin-bottom: 16px;
}

.article-content ul,
.article-content ol {
  margin-left: 20px;
  margin-bottom: 16px;
}

.article-content ul li,
.article-content ol li {
  margin-bottom: 8px;
}

.article-content code {
  background: var(--color-tile-bg);
  padding: 2px 6px;
  font-size: 1rem;
  font-family: 'JetBrains Mono', 'Fira Code', 'Source Code Pro', Consolas, Monaco, 'Courier New', monospace;
}

.article-content pre {
  background: #282c34;
  border: 1px solid #3e4451;
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 16px;
  border-radius: 4px;
}

.article-content pre code {
  background: none;
  padding: 0;
  color: #abb2bf;
}

.hljs {
  background: #282c34 !important;
  color: #abb2bf;
}

/* Tables */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
}

.article-content table th {
  background-color: #f5f5f5;
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
}

.article-content table td {
  border: 1px solid var(--color-border);
  padding: 12px 16px;
  color: var(--color-text);
}

.article-content table tbody tr:nth-child(odd) {
  background-color: #fafafa;
}

.article-content table tbody tr:hover {
  background-color: #f0f0f0;
}

/* Breadcrumb */
.breadcrumb {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--color-link);
}

.breadcrumb a:hover {
  color: var(--color-link-hover);
}

/* Tip / Callout Components */
.tip {
  padding: 16px;
  margin: 20px 0;
  border-left: 4px solid;
  background-color: #f5f5f5;
  border-color: #073b66;
}

.tip.tip-warning {
  background-color: #fffbf0;
  border-color: #d97706;
}

.tip.tip-important {
  background-color: #fef2f2;
  border-color: #dc2626;
}

.tip.tip-note {
  background-color: #f0f9ff;
  border-color: #0284c7;
}

.tip strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
}

.tip p {
  margin: 0;
  color: var(--color-text);
}

.tip p + p {
  margin-top: 8px;
}

.tip a {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

.tip a:hover {
  opacity: 0.8;
}